Alphonse Kruizinga, 34, killed 19-year-old Marcin Bilaszewski after following the victim and his friends as they made their way to an 18th birthday party.

He had earlier claimed “Hitler should have killed all the Polish people” and threatened to “get each of them one by one”.

The victim suffered a knife wound to the back as he tried to defend his girlfriend Anna Betlinska during a fight outside Finsbury Park station in Seven Sisters Road.

Kruizinga, a homeless Dutchman, was cleared of murder after he claimed he was repeatedly attacked by up to 20 youths who stole his rucksack.

He was convicted of manslaughter by a majority of ten to two.

The killer will serve at least five years and three months behind bars before he is eligible for parole.

Judge William Kennedy ruled Kruizinga to be a dangerous offender and handed down a sentence for public protection.

The Old Bailey heard Kruizinga had repeatedly clashed with the group of Polish youths outside his squat in Clapton Common.

Kruizinga had previously been involved in a fight with some of Mr Bilaszewski’s friends and seemed intent on inciting further trouble. He had armed himself with a kitchen knife that he had concealed up his sleeve.

Mr Bilaszewski and his friends repeatedly asked Kruizinga to leave them alone but he persisted and followed them off the bus at Finsbury Park Tube station.

He continued to threaten them and when Mr Bilaszewski’s girlfriend attempted to stop him he punched her.

Mr Bilaszewski intervened to defend her and Kruizinga drew the knife he had been concealing and stabbed him in his back.

When Kruizinga was arrested several days later, he was carrying two knives one concealed up each sleeve.

Kruizinga, 34, of no fixed abode, was sentenced to a minimum period in jail of five years for the manslaughter of Marcin Bilaszewski.

He was also sentenced for two counts of possession of offensive weapons, totalling 36 months, to be served concurrently.

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